Shock-absorbing device.



No. 845,149. PATBNTED FEB. 26, 1907.

J. C. WANDS. SHOCK ABS'ORBING DEVICE. APPLIUATION FILED sPT.17,1906.

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SHOCK-ABSORBING DEVICE..

No, 845,149. K Specification of Letters Patent. Patented Feb. 26, 1907.

Annlieatinn tiled September 17,1906. SerialNe1 334964iI e it known that. i, John C. Warns, a citi zen ot the United States, residing at St. lionis, Missonri, have invented a certain new and ttsei'ul improvement in Shock-Absorbing Devices, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which-- Figure l is a longitudinal view through my improved device, and Fig. 2 is a detail view showing the manner ot mounting the spring.

This invention relates to a new and usci'` l improvement in shock-absorbing devices for friction draft-gear,4 buil'ers, tbc., the object being to so combine the parts having tln'eaded connection with each other and a spring or springs that movement of one ot the threaded parts will brace the spring or springs under tension or compression, the case may be, which supplementing the i'riction-faces of the threads will absorb shocks or jars.

V'Vhile il. have mentioned in the above that the shock-absorbing device of in vprescnt application may be used l'or friction draft -rigging and in car-biril'ersnt is obvious that the device is also useful as a ctshioning device tor automobiles and wagons and bolster i supports for car-tricks, &c.

in the accompanying drawings l and 2 indicate cnd pieces which Ymaiv be designated as heads and which :nav be formed with hgs or ears to i'orm seats i`or the vokcs ot' earcotplers, if thedvice is Lscd in friction tlratt-rigging,-or said heads ma)r have perforated ears or other fastening devices for engagement with a sapport and the part to be snpportcd.

3 and 4 arethreadcd stems extending inwardl)r from the head-pieces and prcfcrabl)v in axial alinement with each other, ihe threads on stems and 4 are pitched to the right and lel't, respectively. These threaded stems are shown-in the drawings asheingseparatel)Y made from the. head-pieces and keyed in position, which constriction simpliiies and reduces the cost of manufacture. ,l I

5' indicates a nut, which nut is .preferably made in two parts whose contiguous ends are hanged and secured together, as shown. This nut has two female threads cut in it, one

. ,right and the other left, said threads engsstgl l* ing the correspondingly pitched lthreads et the threaded stems 3 and 4, extending ini ward lv from the head-pieces.

t3 is a spring whose ends are connected to the head-pieces 1 and 2 and whose medial portion is provided with a reversing bend titting in a slot in. the centrally-arranged flange on the nut. in. order tohold the spring in the slot, a rivet 5fL is arranged in the outer end of the slot for the pt-rpose of' holding the spring in pla-cc.

Instead oi using a spring made of a single piece, shown in the drawings, it is obvious that two oppositcl'v-coilcd springs could be i sed, which wo;,ld be equivalent to cutting thc reversing` bend oi the single spring shown in the drawings. B v making the spring of a single piece oli material the opposing coils 'an be formed b v al single ceiling operation, and the single piece otl material possesses the Further advantage of simplifying the con.r

` nection between the ends of the spring of the opposing coils` and the nut.

The heads l and 2 are provided with eX- tensions 'T and S, constituting a housing for the parts. Sections oll this housing telescopicallv engage each other and preferably have slot-'and-pin connection u ith each other for thc purpose ol maintaining alinernent of the heads. This housing may he dispensed with, if desired, as its onl)Y value is to protect the moving parts and maintain the alinement of the heads in the event that the coils of the spring or springs on opposite sides of the nut are placed mider tneqt al tension.

the right and lett hand threaded connection 'between the stems and the doubleitched nut causes the nut to rotate when the leads are under load, and this rotation of the nut places the oppositely-wound springs under tension or compression, as the case may be. lYhile i have shown torsion-springs and while I prel'cr to arrange these torsionsprngs so that the)v will be wound up under load it obvious that other forms of springs could be employed which would act in the same wav as the torsion-springs shown' and assist the friction of the inclined faces ot the threads in uttering resistance to the 1nove-` nient ot the load upon the nut. v

Having thus described the invention, what s claimed as new, and desired to be secinedl by Letters Patent, isl l. In a shock-absorbingdevice, the combi- IOO nation with two head-pieces havingthxeadedw projections, the 'threads of said prei eetions'be ing oppositely pitched, a movable part having oppositely-pitched threadsI tor engaging with said pro iections, and springs in which i power is stored upon the movement ol said movable part substantially 'as described` 2. In a shock-absorbing device, the'comhination ot" two l'iead-pieces, threaded projec tions extending inwardly trom said head.` pieces, the threads of sa.d projections being t oppositely pitched, a movable part having oppositely-pitchcd threads for engaging with said projections, springs conne'eitled to sai-d head-pieces and said movable part, and a l housing for inclosing sai-d parts, said housing g being composed or parts telescopically ari ranged with respect to each other; snbstanl tially as described.

3. .ln a shock-absorbing device, the eombij nation olftwo |'iead-pieees having inwardlyextending threaded projections, the threads ol' sa.d projections beng oppositely pitched, a movable part having oppositely-pitched threads l'orengagemcnt with said projections, springs connected to said head-pieces and.` said movable. part, said springs beingcoiledin opposite directions, and a. housing inclosing said springs and `movable part, substantially gy as described. v

4. ln a shock-ahsorbing device, 'the eombi- I nation ol two head-pieces, threaded projections extending inwardly l'ron'l said head pieces, the threads ol' said projections being oppositely pitched, a movable part having oppositely-p.tohed threads lor engagement ,i with said projections, and springs connected L .to said head-pieces and said movable part; substantially as described.

v 5. in a shock-absorbing device, the combination of two head-pieces having oppositelypitched, inwardly-extending threaded posts, a nut having oppositcly-pitched interior threads for engagement with said posts, and springs connected to said head-pieees and said nut, substantially as described.

6. In a shock-absorbing device, the combination ol two head-pieces having inwardlyextending posts, said posts having right and let't hand screw-threads re peetively, a nut Ihaving right and lett hand screw-threads tor engagement with said posts, and oppositelycoiled .springs connected to sad head- )ieces and said mit, sul'istantially as described.

7. in a shock-absorbing device, the con'ibination of two head-pieces having irnvardlyextcnding posts, said posts having right and lett hand screw-threads respectively, a nnt having right and left hand screw-tln'eads l'or engagenient with said posts, and two springs lorined ol' a single piece oli material provided -with. a reverse bend, the ends ol' said piece being connected' to said head-picces and the reverse bend beingl connecled to said nut; substantially as described.

.ln testimony whereol l hereunto allix my signature, in 'thc,prcsenee o two witnesses, this 13th dav ol' September, lftlt'.

'itnesscs:

l". lt.' tfonswAim, (monos luticwictt.. 

